[Uukrul]

What CPU do you have?

AMD FX-6300, but I don't think it should matter. With MPC-HC the CPU uses a mere 2% playing the sample:



Btw, is your GTX 970 showing the [H/W] text?. According to this article:

One advantage the GM206 GPU holds over GM204 is its new video engine. While the GeForce GTX 970 and 980 support H.265 (HEVC) video encoding, only the GeForce GTX 960 decodes this forward-looking format. The GeForce GTX 960 promises to be an excellent choice for home theater PCs with the ability to play back 4K video at low power, and natively supporting HDCP 2.2 content over HDMI 2.0.

it doesn't support HEVC video decoding and that's one of the reasons I got the GTX 960.